System constants and predefined constant collections in ThinkPHP_PHP tutorial

ThinkPHP system constants and predefined constants are summarized as follows:

1. System constants:

THINK_PATH // ThinkPHP system directory:
APP_PATH // Current project directory
APP_NAME // Current project name
MODULE_NAME //Current module name
ACTION_NAME // Current operation name
TMPL_PATH // Project template directory
LIB_PATH //Project class library directory
CACHE_PATH // Project template cache directory
CONFIG_PATH //Project configuration file directory
LOG_PATH //Project log file directory
LANG_PATH //Project language file directory
TEMP_PATH //Project temporary file directory
PLUGIN_PATH // Project plug-in file directory
VENDOR_PATH // Third-party library directory
DATA_PATH //Project data file directory
IS_APACHE // Whether it belongs to Apache
IS_IIS //Whether it belongs to IIS
IS_WIN //Whether it belongs to Windows environment
IS_LINUX //Whether it belongs to Linux environment
IS_FREEBSD //Whether it belongs to FreeBsd environment
NOW_TIME // Current timestamp
MEMORY_LIMIT_ON // Is there a memory usage limit
MEMORY_LIMIT_ON // Is there a memory usage limit
OUTPUT_GZIP_ON //Whether to enable output compression
MAGIC_QUOTES_GPC // MAGIC_QUOTES_GPC
THINK_VERSION //ThinkPHP version number
LANG_SET // Browser language
TEMPLATE_NAME //Current template name
TEMPLATE_PATH //Current template path
__ROOT__ // Website root directory address
__APP__ // Current project (entry file) address
__URL__ // Current module address
__ACTION__ // Current operation address
__SELF__ // Current URL address
TMPL_FILE_NAME //The default template name of the current operation (including path)
WEB_PUBLIC_URL //Website public directory
APP_PUBLIC_URL //Project public template directory

2. Predefined constants:

WEB_LOG_ERROR=0 // Error log type
WEB_LOG_DEBUG=1 // Debug log type
SQL_LOG_DEBUG=2 // SQL log type
SYSTEM_LOG=0 // System mode recording log
MAIL_LOG=1 // Record log by email
TCP_LOG=2 // TCP mode logging
FILE_LOG=3 // Record log in file mode
DATA_TYPE_OBJ=1 //Return in object mode
DATA_TYPE_ARRAY=0 // Return in array mode
URL_COMMON=0 // Normal mode URL
URL_PATHINFO=1 // PATHINFO URL
URL_REWRITE=2 // REWRITE URL
HAS_ONE=1 // HAS_ONE association definition
BELONGS_TO=2 // BELONGS_TO association definition
HAS_MANY=3 // HAS_MANY association definition
MANY_TO_MANY=4 // MANY_TO_MANY association definition
EXISTS_TO_VAILIDATE = 0 // Validate if fields exist in the form
MUST_TO_VALIDATE = 1 // Must verify
VALUE_TO_VAILIDATE = 2 // Validate if the form value is not empty

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